Question: What is the group IB flammable liquid with min surface tension whose instance of chemical compound?
Paraphrase: What is the group IB flame - retardant liquid with min surface tension whose chemical compound instance?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q21009055 . ?ent wdt:P3013 ?obj . ?ent wdt:P31 wd:Q11173 } ORDER BY DESC(?obj)LIMIT 5 
Answer: allyl alcohol, allyl alcohol, ethyl acetate, ethyl acetate, allyl alcohol